A wave is split by fencing along the Mexico-U.S. border at Tijuana, Baja California and Imperial Beach, California. From Tomas van Houtryve’s series “Implied Lines,” 2018. ©Tomas van Houtryve. Courtesy of
Griselda San Martin
A young man speaks to his family member through the border fence at Friendship Park, a meeting place on the border between Tijuana, Mexico and San Diego, California. For many families separated by immigration status, it is the only way that they can see their loved ones in person. Photo by Griselda San Martin from her series “The Wall.”Courtesy of the artist.
Dorothea Lange, Crossing the international bridge between Juarez, Mexico and El Paso, Texas 1937. Courtesy of the Library of Congress.
Dorothea Lange, Wife of a Mexican sharecropper near Bryan, Texas, 1938. Courtesy of the Library of Congress.
Richard Misrach, Wall, east of Nogales, Arizona, 2015, from Border Cantos (Aperture, 2016). © Richard Misrach. Courtesy Fraenkel Gallery, Pace/MacGill Gallery, and Marc Selwyn Fine Art.
Brown Field Station in San Ysidro. Photo by Ken Light/Contact Press Images. © Ken Light.
San Ysidro, June 2, 1985. Photo by Ken Light/Contact Press Images. © Ken Light. Courtesy of the artist.
San Ysidro, March 29, 1986. Photo by Ken Light/Contact Press Images. © Ken Light. Courtesy of the artist.
Fresh migrant footprints through a dried up pond in Mexico just south of Mission, Texas, near the Rio Grande River. Photo by Kfrom the series “As Above So Below,” 2014–2015. Courtesy of the artist.
USA. San Ysidro, Ca. Mexican children playing with kite on the U.S. side of the border. (They are in the U.S. illegally.) The houses below them are in Tijuana, Mexico, where they live. Photo by Alex Webb. © Alex Webb/Magnum Photos. Courtesy of Magnum Photos
Central American migrants traveling in the 'Migrant Via Crucis' queue outside the Padre Chava's kitchen soup for breakfast and legal counseling, in Tijuana, Baja California State, Mexico, on April 27, 2018. Photo by Guillermo Arias/AFP/Getty Images.
An Anduril surveillance tower is tested on the border in southwestern Texas. Photo by Benjamin Rasmussen. © Benjamin Rasmussen. Courtesy of the artist.
A man looks through the U.S.-Mexico border fence into the United States on September 25, 2016 in Tijuana, Mexico. Photo by John Moore/Getty Images. From Undocumented by John Moore, published by powerHouse Books.
Header video: An excerpt of Thomas van Houtryve, Divided, 2018. Courtesy of the artist.
Correction: A previous version of this article stated that Kirsten Luce appealed to local authorities to ride in their helicopters; she appealed to the Department of Homeland Security. Additionally, Luce shot her second series for TIME in 2015.